18 Paul, having stayed after this many more days, took his leave of the brothers, [1] and sailed from there for Syria, together with Priscilla and Aquila. He shaved his head in Cenchreae, for he had a vow. 19 He came to Ephesus, and he left them there; but he himself entered into the synagogue, and reasoned with the Jews. 20 When they asked him to stay with them a longer time, he declined; 21 but taking his leave of them, and saying, “I must by all means keep this coming feast in Jerusalem, but I will return again to you if God wills,” he set sail from Ephesus.
Matthew Henry's Commentary on Acts 18:18-21
Commentary on Acts 18:18-23
(Read Acts 18:18-23)
While Paul found he laboured not in vain, he continued labouring. Our times are in God's hand; we purpose, but he disposes; therefore we must make all promises with submission to the will of God; not only if providence permits, but if God does not otherwise direct our motions. A very good refreshment it is to a faithful minister, to have for awhile the society of his brethren. Disciples are compassed about with infirmity; ministers must do what they can to strengthen them, by directing them to Christ, who is their Strength. Let us earnestly seek, in our several places, to promote the cause of Christ, forming plans that appear to us most proper, but relying on the Lord to bring them to pass if he sees good.